JP2008168320A - Structure and material control system of rolling line - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a structure and material control system of a rolling line by which products the structure and material specification of which satisfy the structure and material specification required by customers are efficiently manufactured. <P>SOLUTION: This system is provided with: a manufacturing order deciding means 33 for deciding the manufacturing order on the basis of an order data base 31 and a base stock data base 32, and an order information and a base stock information; a manufacture commanding means 34 for preparing a list of the manufacture command information on the basis of the manufacturing order; a rolling line control means 6 for controlling equipment on the basis of the list of manufacturing order information; a rolling data collecting means 41 for collecting a rolling result data; a structure and material model 42 for calculating the structure and the material on the basis of the rolling result data; a structure and material deciding means 43 for deciding whether the structure and the material satisfy the structure and material specification or not; and an allotting means 35 for allotting the order information which is allottable to the rolled product by retrieving the order data base when the decided result does not satisfy the structure and material specification. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rolling line structure / material management system that enables efficient production of products that satisfy the structure / material specifications required by customers.

  In recent years, the specifications required by customers for rolled products have become stricter, and in recent years, in addition to the dimensions and shape of rolled products, it is important to keep the structure and material such as strength and ductility within acceptable limits. ing. Production of such advanced products requires increasingly advanced technologies, such as large strain processing and high-precision management of material temperature. However, when these technologies are applied to actual operations, the processing conditions and temperature conditions differ between the surface and inside of the material, the tip and tail ends, and the flow rate changes also in the cooling device after finish rolling. Due to the delay in the response, a shift occurs in the process of transformation from the normal austenite region to the ferrite region, and it is difficult to keep the cooling rate uniform.

  In addition, various attempts have been made to create different metallographic structures and materials according to their uses. For example, when cooling a metal material after hot rolling, a method of injecting a large amount of cooling water at a high pressure to increase the cooling rate, changing the metal structure, and starting to have a desired tensile strength and ductility can be used. ing. However, when such a manufacturing method is put to practical use, there is a problem in that there is no method for efficiently measuring whether the manufactured metal material satisfies the required structure and material. Conventionally, for example, mechanical properties such as tensile strength, ductility, and formability were measured by a destructive test such as a tensile test, but (i) several hours to several days are required until an inspection result is obtained. ii) There was a problem that the total number could not be measured because of destructive testing. For this reason, it has been strongly desired to detect the tissue structure and material without performing a destructive inspection.

  In recent years, so-called microstructure / material prediction technology has been developed to estimate mechanical properties based on the metal structure obtained by calculation from rolling process conditions based on the mechanical properties obtained by destructive inspection as described above. ing. Until now, when shipping hot-rolled coils, etc., which are rolled materials of products, materials called mill sheets are attached to prove whether they conform to JIS standard values etc. according to customer requirements. There is a case. In this case, in addition to the main component values, the tensile strength obtained by the destructive inspection is usually entered. In recent years, however, there has been a movement to recognize the use of values calculated by the above-described structure / material prediction technology for quality assurance in overseas countries and the like.

  As described above, the use of the structure / material prediction technology has been promoted, but until now, it has been used in limited fields such as means for determining the manufacturing conditions. For example, a method has been proposed in which a manufacturing condition that satisfies a required specification is obtained based on a database that stores a range of manufacturing condition instruction values and actual values of mechanical properties at that time (see, for example, Patent Document 1). .

  Furthermore, when there is no track record that satisfies the required specifications, it has been proposed to use the structure / material prediction model to predict the structure / material and to obtain manufacturing conditions that satisfy the required specifications (see, for example, Patent Document 2). .

Japanese Patent No. 3053251 Japanese Patent No. 3053252

As described above, there has been proposed a method for obtaining a manufacturing condition for creating a structure / material by rolling by predicting the structure / material, but whether the structure / material after manufacturing satisfies the required specifications. No examination based on material prediction has been conducted, and only a method by destructive inspection has been carried out. Since this destructive inspection takes time and effort as described above, it is usually called “change of lot”, and it has been performed once as a representative sample when the steel grade is changed or the target thickness or width is changed. It is. And if the structure and material of the product is out of the acceptable range, (1) the shipment to the customer and transportation to the lower process will be stopped, and (2) the problem in the manufacturing process in order to respond to the customer's order. After correcting the points, products that meet the required specifications must be manufactured again within the delivery date.
As described above, the conventional rolling structure / material management system as described above has the following problems.

  Conventionally, the structure and material of a rolled material is usually measured by a destructive inspection method such as a tensile test in a laboratory after a part of the rolled material is cut out and processed into a predetermined specimen shape after rolling. Met. However, such a conventional structure / material measuring method requires a great deal of labor, and therefore cannot be completely inspected, and must be a sampling inspection. For this reason, for products that were not subject to sampling inspection, there is a possibility that the structure and material are not necessarily within the allowable range, and a defective product is treated as a non-defective product, and is shipped to the customer or the lower process. There was a possibility.

  In addition, the above conventional structure / material measurement method requires several hours to several days in order to obtain the measurement results, and the correction process of the manufacturing process is not necessarily automated, There was a problem in that many defective products were manufactured during the delay time until the structure and material defects were discovered by correction and sampling inspection and the manufacturing process was corrected.

  In addition, since it takes time to obtain the inspection results as described above, the delivery destination change process at the time of shipment stoppage is not in time for the start of the transportation work, and the product that has been transported to the originally planned delivery destination is moved to another delivery location. There was a possibility that wasteful cost of re-transporting would occur, and additional work performed in the lower process could be wasted.

  In addition, since it takes time to obtain the test results as described above, there is a problem that the remanufacturing is delayed when the structure / material of the product is out of the allowable range, and the delivery date may not be observed. . Of course, there is a method of pre-manufacturing in advance in consideration of the manufacturing yield in order to prevent a delay in delivery time, but in this case, inventory storage costs occur. In recent years, the number of types of rolled products has been increasing in order to meet customer demands, and there has been a demand for just-in-time for strict adherence to specified delivery dates.

  This invention is for solving the problems of such a conventional rolling structure and material management system, using the actual value of the rolling line to calculate the structure and material immediately after rolling by the structure and material prediction model, Prevents slipping through inspection of the structure and material, minimizes delay time until correction of the manufacturing process, suppresses defective products, prevents useless costs associated with delivery destination changes, and delays in delivery due to delays in product remanufacturing Therefore, the present invention provides a rolling line structure / material management system capable of greatly improving the total operation efficiency of the rolling line.

  In the rolling line structure / material management system according to the present invention, in order to manage a rolling line for manufacturing a rolled product, an order database for storing order information including the structure and material specifications of the rolled product, and the rolled product material A material database for storing material information including information on the manufacturing method, a manufacturing order determining means for determining a manufacturing order of rolled products based on the order information stored in the order database and the material information stored in the material database, and the manufacturing order Based on the manufacturing order determined by the determining means, based on the manufacturing instruction means for creating a list of manufacturing instruction information for instructing the manufacture of the rolled product, based on the list of manufacturing instruction information created by the manufacturing instruction means, Rolling line control means for controlling equipment in the rolling line and collecting rolling record data from the rolling line Based on the rolling data collection means, the structure / material model for calculating the structure / material based on the rolling record data collected by the rolling data collection means, the calculated value of the structure / material model, and the order information stored in the order database If the judgment result of the structure / material determination means and the structure / material determination means that determine whether the rolled product meets the structure / material specification or not, the order database is searched And provision means for assigning order information that can be assigned to the rolled product.

  According to the present invention, the structure / material prediction model is used to calculate the structure / material immediately after rolling using the actual rolling line value, prevent the inspection of the product structure / material, and minimize the delay time until the manufacturing process is corrected. Suppressing the occurrence of defective products, preventing unnecessary costs associated with changing delivery destinations, and preventing delays in delivery due to delays in product remanufacturing, greatly improving the total operational efficiency of the rolling line effective.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a block diagram showing a configuration of a structure / material management system for a rolling line according to Embodiment 1 of the present invention. The arrows in the figure mainly represent the direction of data flow.

  The system includes a rolling line 1, a transport device 2, a product management device 3, a structure / material determination device 4, a transport control device 5, and a rolling line control device 6. The rolling line 1 is a line for producing a rolled product (coil) 8 from a rolled material (hereinafter referred to as slab) 7.

The rolling line 1 includes a heating device 11, a pressurizing device 12 including a rolling mill, a cooling device 13, a winding device 14, and a conveyance table 15 that connects them, and is driven by an electric motor, a hydraulic device, or the like.
The heating device 11 is a furnace for heating the slab 7.
The rolling mill 12 is composed of one or a plurality of stands. For example, the rolling mill 12 is composed of one stand reversible rough rolling mill and seven stands tandem finishing rolling mill.
The cooling device 13 is a device that cools the rolled product with cooling water in order to control the temperature of the rolled product (including the state in the middle of being completed as a product from the slab, and so on). The cooling device is, for example, a runout table, a cooling table, or the like.
The winding device 14 is a device for winding up the rolled product.
The conveyance table 15 is an apparatus for conveying the rolled product in each process to the next process.

  The conveyance apparatus 2 is an apparatus for conveying the rolled product manufactured by the rolling line. The conveyance device 2 is, for example, a walking beam, a conveyor, a crane, or an automobile.

  The product management device 3 manages the manufacturing process of the rolled product. The product management apparatus 3 is configured by a computer. The computer is an apparatus that causes an arithmetic processing unit (for example, a CPU) to perform arithmetic processing of data in accordance with, for example, a program stored in a storage medium.

  The structure / material determination device 4 determines whether or not the structure / material of the rolled product is outside the allowable range based on the calculated value from the structure / material model. The tissue / material determination device 4 is configured by a computer.

  The conveyance control device 5 controls a conveyance device that conveys the rolled product based on an instruction from the product management device. Moreover, based on the determination result of the structure | tissue / material determination apparatus 4, control which changes the conveyance destination of a rolled product is made into a conveyance apparatus. The conveyance control device 5 is configured by a computer.

  The rolling line control device 6 is a device that controls each device constituting the rolling line. The rolling line control device 6 sets and controls each device of the rolling line based on the manufacturing instruction information from the manufacturing instruction function. For example, the rolling line control device 6 adds the automatic sheet thickness control for changing the roll gap of the rolling mill in order to match the product sheet thickness to the target value, and supplies the heating furnace to the heating furnace in order to match the furnace extraction temperature to the target value. Furnace combustion control that changes the amount of fuel input and temperature control function that changes the roll rotation speed and cooling water amount of the rolling mill to match the temperature at the temperature control point on the exit side of the rolling mill to the target value .

Next, details of each device will be described.
The product management apparatus 3 includes an order database 31, a material database 32, a manufacturing order determination function 33, a manufacturing instruction function 34, and an allocation function 35.

  The order database 31 is a database that stores a list of order information from customers. The order information includes information such as a material type code determined by an alloy component and the like, a product size and an allowable range of a product structure / material, a delivery destination of a product, a delivery date, and other specifications requested by a customer.

  The material database 32 is a database that stores dimensions, possession status, a list of scheduled arrival dates, information on other materials, and the like regarding the slab.

  The manufacturing order determination function 33 refers to the order database 31 and the material database 32 to determine the manufacturing order of the rolled products on the rolling line so as to keep the delivery date.

This is done as follows.
First, the manufacturing order determination function 33 determines the temperature target value at the temperature control point of the rolling process so that the structure and material of the product are within the allowable range. This temperature control point is, for example, the extraction position of the heating furnace or the installation position of a temperature measurement device such as a radiation thermometer. Further, the temperature target value is determined by storing numerical values based on past operation results in the form of a numerical table in the computer, and indexing the material type and the target dimension as keys.

Next, the production order determination function 33 considers production restrictions due to changes in the temperature profile of the heating furnace, changes in the roll profile (diameter distribution in the width direction) due to wear and thermal expansion of the rolling roll of the rolling mill, and the like. Determine the manufacturing order. For example, first, material types having substantially the same extraction temperature are collected, and then the manufacturing order is determined so that the plate width change pattern becomes a so-called coffin schedule.
Further, the manufacturing order determination function 33 also performs a process of shifting the manufacturing order backward when the scheduled arrival date and time of the slab is late and is not in time for the charging time into the heating furnace.

  As shown in FIG. 2, the coffin schedule changes the target plate width W between the roll change time T1 and the next roll change time T2, that is, during the roll campaign CA, according to the number of coils CO. It is a way to go.

  The manufacturing instruction function 34 creates a list of manufacturing instruction information sorted in the manufacturing order based on the output of the manufacturing order determination function 33. The manufacturing instruction information 34a includes the above-mentioned temperature target value in addition to the extracted order information necessary for the rolling line, such as the product dimensions and the allowable range of the product structure / material, the delivery destination of the product, and the delivery date from the order information. It is a waste.

  The allocation function 35 makes an inquiry to the order database 31 when the determination result for the rolled product of the structure / material determining device 4 is outside the allowable range, and searches for an order that matches the required specifications for the rolled product. In other words, for example, when the actual temperature value is different from the target value and the crystal grain size of the rolled product is coarsened and the planned strength cannot be obtained, the intended use is not met. If they are different, they do not require that much strength and may meet the specifications. In such a case, there is a possibility that it meets the requirement specification of another order, and such an order is searched. If there is an order that matches the required specifications for the rolled product in the order database, the order obtained as a search result is assigned to the rolled product.

Specifically, the allocation function 35 changes the export destination of the rolled product to the export destination described in the order information obtained as a search result, and finally deletes the order from the order database 31 as manufactured. To do.
If there is no matching order, the allocation function 35 outputs a command signal to the conveyance control device 5 and sets the destination of the rolled product as a defective product temporary storage area. In this case, the rolled product waits for an order that matches in the future as a defective product that is not scheduled to be shipped, or is carried out as a recycling material such as remelting.

In addition, when the determination result for the rolled product by the structure / material determining device 4 is out of the allowable range, the allocation function 35 re-executes as follows based on the order information of the rolled product (hereinafter referred to as order information A). Manufacture.
First, the manufacturing instruction information 34a created by the product management device 3 corresponding to the slab in the heating furnace is searched, and the steel type and the slab size that match the order information A are extracted. At this time, those with greatly different extraction temperature target values are excluded in consideration of the temperature change speed constraint of the heating furnace. In addition, in consideration of roll profile constraints (for example, coffin schedule), those with greatly different target plate widths are also excluded. Further, items with a delivery date earlier than the delivery date of the order information A are also excluded.

  Thus, the slab obtained as a search result is selected with the earliest manufacturing order, and the order information A is assigned to this slab. Then, since the production schedule of the slab to be allocated is undecided, the order information (hereinafter referred to as order information B) is searched in the same manner as described above to allocate the slab. This operation is repeated until no product matching the manufacturing information of the slab in the heating furnace is found. When the manufacturing instruction information for the slab in the heating furnace does not match the order information A or the order information B, the same content as the order information is added to the order database, and the manufacturing order is re-established for the manufacturing order determination function. A function for requesting re-determination of manufacturing order for requesting determination is provided. At this time, when the quantity of slabs having the required structure / material and dimensions is insufficient, a warning that the slab purchase is necessary is displayed on the screen. It is also possible to connect to a purchasing system and automatically place an additional order for slabs.

  Next, the structure / material determination device 4 includes a rolling data collection function 41, a structure / material model 42, and a structure / material determination function 43.

  The rolling data collection function 41 collects rolling data related to the rolled product including not only actual values such as temperature and load when rolling, but also calculated values such as temperature history of each stand and temperature history on the cooling device. It is a function.

  The structure / material model 42 calculates the metal structure based on the rolling data collected by the rolling data collection function 41, and based on this result, among tensile strength, proof stress, elongation, hardness, r value, etc. Any one or more mechanical properties are estimated and calculated by a mathematical model. Various models for predicting the structure and material have been proposed, and a wide range of mathematical formulas representing static recovery, static recrystallization, dynamic recovery, dynamic recrystallization, grain growth, etc. is widely known. It has been. As an example, an example is described in Plastic Processing Technology Series 7 Plate Rolling (Corona) P198-229. From these, the crystal grain size of the rolled product, the volume ratio of ferrite, pearlite, bainite, martensite, and the like can be grasped. It is widely known that based on such metal structure information, it is possible to predict the structure and material such as mechanical properties such as tensile strength and proof stress. As an example, it is published in the 173rd and 174th Nishiyama Memorial Technology Course “Structural Change of Hot Rolled Steel and Prediction of Structure / Material” (P125, Japan Iron and Steel Institute).

  Based on the order information stored in the order database 31, the structure / material determination function 43 determines whether the structure / material of the rolled product calculated by the structure / material model 42 is within an allowable range based on the product information. Based on the determination result, the tissue / material determination function 43 outputs a command signal to the product management device 3 (allocation function or the like) and the transport control device 5 (transport destination change function or the like).

Next, the transport control device 5 includes a carry-out control function 51 and a carry-out destination change function 52.
The unloading control function 51 determines the unloading destination and unloading route of the product after rolling based on the manufacturing instruction information. On the basis of the determination result, the transport device 2 carries out the rolled product and carries it out to the lower process or to the customer. At this time, the carry-out control function 51 determines how to stack the products in accordance with the shipping order, or stores them in a predetermined storage location when the delivery date is too early.

  The carry-out destination changing function 52 immediately re-determines the carry-out destination and outputs the result to the carry-out control function 51 when the determination result by the tissue / material determining function 43 is outside the allowable range. As a result, it is possible to prevent useless costs associated with the change of the delivery destination.

  As described above, according to the present invention, in a rolling line for producing a rolled product, the structure and material management of the rolling line that inspects the structure and material of the rolled product and manages the process of the rolled product based on the inspection result. To provide a system. In addition, it is possible to provide a structure / material management system that can greatly improve the total operation efficiency of the rolling line. Furthermore, it is possible to prevent delays in delivery due to delays in product remanufacturing.

  In the present embodiment, the tissue / material determination function 43 determines whether or not the tissue / material is outside the allowable range based on the information in the order database 31. However, even if the determination is performed using other information. Good. For example, the determination may be made based on information regarding the manufacturing process calculated by the manufacturing order determination function 33. In this case, it is possible to determine the structure / material in accordance with the production management.

  In addition, the number of storage media is not limited to one, and the case where the processing according to the present embodiment is executed from a plurality of media is also included in the storage medium according to the present invention, and the media configuration may be any configuration.

The computer according to the present invention may have any configuration such as a single device such as a personal computer or a system in which a plurality of devices are connected to a network.
In addition, the computer in the present invention is not limited to a personal computer, but includes an arithmetic processing unit, a microcomputer, and the like included in an information processing device, and is a generic term for devices and devices capable of realizing the functions of the present invention by a program. .

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a block diagram showing a configuration of a structure / material management system for rolling lines according to Embodiment 2 of the present invention. The arrows in the figure mainly represent the direction of data flow.

  Here, the same parts as those in the first embodiment are not mentioned. In the second embodiment, mechanical property measuring means 44 and tissue / material model learning means 45 are provided. As described above, the actual measurement value of the mechanical property measured for each lot by the mechanical property measurement unit 44 is used and compared with the actual calculation value of the tissue / material model. Thus, the structure / material model 42 is improved. After learning, the prediction accuracy of the tissue / material model 42 is improved.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. In addition, various inventions can be configured by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

It is a schematic block diagram which shows the outline | summary of board configurations, such as a control panel and a switchboard which are the object of this invention. It is a block diagram which shows the basic composition of the design method of the board outside line cable by Embodiment 1 of this invention. It is a flowchart which shows the cable information extraction process of the design method of the external cable between board | substrates by Embodiment 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling line 2 Conveying apparatus 3 Product management apparatus 4 Structure | tissue and material determination apparatus 5 Conveyance control apparatus 6 Rolling line control apparatus 7 Rolling material (slab)
8 Rolled products (coils)
9 Interface panel unit rearrangement process 11 Heating device 12 Pressure device (rolling mill)
13 Cooling device 14 Winding device 15 Transport table 31 Order database 32 Material database 33 Manufacturing order determination function 34 Manufacturing instruction function 34a Manufacturing instruction information 35 Allocation function 41 Rolling data collection function 42 Organization / material model 43 Organization / material determination function 44 Machine Property measuring means 45 Organization / material model learning means 51 Unloading control function 52 Unloading destination changing function

Claims (6)

In a rolling line management system for managing a rolling line for producing a rolled product,
An order database for storing order information including the structure and material specifications of the rolled product;
A material database for storing material information including information on the material of the rolled product;
Production order determination means for determining the production order of the rolled product based on the order information stored in the order database and the material information stored in the material database;
Manufacturing instruction means for creating a list of manufacturing instruction information for instructing manufacture of the rolled product based on the manufacturing order determined by the manufacturing order determination means;
Based on the list of production instruction information created by the production instruction means, a rolling line control means for controlling equipment in the rolling line;
Rolling data collection means for collecting rolling performance data from the rolling line;
A structure / material model for calculating the structure / material based on the rolling record data collected by the rolling data collection means;
Based on the calculated value of the structure / material model and the order information stored in the order database, the structure / material determination means for determining whether or not the rolled product satisfies the structure / material specification;
When the determination result of the structure / material determination means does not satisfy the structure / material specification, an allocation means that searches the order database and allocates the order information that can be allocated to the rolled product;
A rolling line structure / material management system characterized by comprising: Based on the production order determined by the production instruction means, carry-out control means for performing control to carry out the rolled product produced in the rolling line;
Based on the allocation result of the allocation means, a delivery destination changing means for outputting a command to change the delivery destination of the rolled product to the delivery control means;
The structure / material management system for a rolling line according to claim 1, comprising: In a rolling line management system for managing a rolling line for producing a rolled product,
An order database for storing order information including the structure and material specifications of the rolled product;
A material database for storing material information including information on the material of the rolled product;
Production order determination means for determining the production order of the rolled product based on the order information stored in the order database and the material information stored in the material database;
Manufacturing instruction means for creating a list of manufacturing instruction information for instructing manufacture of the rolled product based on the manufacturing order determined by the manufacturing order determination means;
Based on the list of production instruction information created by the production instruction means, a rolling line control means for controlling equipment in the rolling line;
Rolling data collection means for collecting rolling performance data from the rolling line;
A structure / material model for calculating the structure / material based on the rolling record data collected by the rolling data collection means;
Based on the calculated value of the structure / material model and the order information stored in the order database, the structure / material determination means for determining whether or not the rolled product satisfies the structure / material specification;
When the determination result of the structure / material determination means does not satisfy the structure / material specification, the same order as the order information corresponding to the rolled product is added to the order database, and the production order determination means Re-deciding means for requesting re-determination of the production order determined by the rolled product;
A rolling line structure / material management system characterized by comprising: In a rolling line management system for managing a rolling line for producing a rolled product,
An order database for storing order information including the structure and material specifications of the rolled product;
A material database for storing material information including information on the material of the rolled product;
Production order determination means for determining the production order of the rolled product based on the order information stored in the order database and the material information stored in the material database;
Manufacturing instruction means for creating a list of manufacturing instruction information for instructing manufacture of the rolled product based on the manufacturing order determined by the manufacturing order determination means;
Based on the list of production instruction information created by the production instruction means, a rolling line control means for controlling equipment in the rolling line;
Rolling data collection means for collecting rolling performance data from the rolling line;
A structure / material model for calculating the structure / material based on the rolling record data collected by the rolling data collection means;
Based on the calculated value of the structure / material model and the order information stored in the order database, the structure / material determination means for determining whether or not the rolled product satisfies the structure / material specification;
When the determination result of the structure / material determination means does not satisfy the structure / material specification, an allocation means that searches the order database and allocates the order information that can be allocated to the rolled product;
When there is the order information to which the allocation result of the allocation unit can be allocated, a destination change unit that outputs a command to change the destination of the rolled product to the export control unit;
When there is no order information that can be assigned by the allocation means, the order information that is the same as the order information corresponding to the rolled product is added to the order database, and the rolling order is determined with respect to the manufacturing order determination means. Production sequence redetermining means for requesting redetermination of the production sequence determined by the product;
A rolling line structure / material management system characterized by comprising:   The structure / material judgment means is based on the actual value of the rolling data collection means, and the crystal grain size of the rolled product and the volume ratio of any one or more of the phases of ferrite, pearlite, bainite, and martensite. The mechanical property of any one or more of tensile strength, yield strength, elongation, hardness, and r-value is estimated based on this by using a mathematical model. 4. The structure / material management system for a rolling line according to any one of 4 above.   The tissue / material model has a tissue / material model learning function that learns the structure / material model using actual performance information measured after rolling for the purpose of improving accuracy. The structure / material management system for a rolling line according to any one of claims 1 to 5.

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